1. REACTION TIME

Uses RT data from Alc Caf for condition 4 (Placebo-placebo) and condition 5 (Control).

“Current” trial will be included if:
1) Current trial is not the first trial of the block (i.e. trial 1, 101, 201, 301 etc. are not included).
2) Both current trial and previous trial are correct.
3) RT is longer than 200 ms and shorter than 2000 ms.

The following subjects were excluded:
- 92 (wrong number of trials, possibly data collection error)
- 64 (<50% accuracy rate)

Each subject did 800 trials, with 100 trials in each of 8 blocks.

Total sample is 50 subjects.

Trigger Codes: Comp: Target Left, Flanker Left = 110.
Comp: Target Right, Flanker Right = 130.
Incomp: Target Left, Flanker Right = 150.
Incomp: Target Right, Flanker Left = 170.

CompleteRep (24.3%) = repetition of same trial (e.g., excludes 110 following 110)
AnyRep (74.8%) = either target or flanker is repeated (only includes 110/130 pair, 150/170 pair)
TargetRep (25.3%) = target is repeated (excludes 150/110 pair, 170/130 pair)
FlankerRep (25.2%) = flanker is repeated (excludes 150/130 pair, 170/110 pair)

##   compatible Incompatible 
##     381.9253     430.3319
##     compatible_compatible   compatible_Incompatible   incompatible_compatible incompatible_Incompatible 
##                  379.9518                  430.5187                  384.0536                  430.1285

A. TargetRep trials taken out

Plot over whole task

Slopes and estimates of lines are from the MLM, not fitted with OLS.

Simple slopes

Trial is scaled to range from 0 to 8 (instead of 1 to 800) so that the betas associated with trial are a little bigger (but significance testing is unaffected by linear scaling, so the test statistics and p values will be the same as if we used the unscaled Trial variable).

Estimate SE ci95_lower ci95_upper Current Previous Color
-0.480 0.370 -1.22 0.260 Compat Compat blue dashed
-0.397 0.548 -1.49 0.699 Compat Incompat red dashed
-0.444 0.546 -1.54 0.648 Incompat Compat blue solid
-1.854 0.403 -2.66 -1.048 Incompat Incompat red solid
Fixed effects of Trial and interactions with Trial:

Trial is centered and scaled to range from -4 to 4.

Estimate Std. Error df t value Pr(>|t|)
Trial.begin -0.740 0.236 25664.33 -3.131 0.002
Current.e:Trial.begin -0.355 0.236 25652.28 -1.500 0.134
Previous.e:Trial.begin -0.327 0.236 25660.68 -1.385 0.166
Current.e:Previous.e:Trial.begin -0.412 0.237 25655.07 -1.742 0.082
Fixed effects at beginning of task:
Estimate Std. Error df t value Pr(>|t|)
(Intercept) 410.402 7.255 50.652 56.569 0.000
Current.e 28.374 1.729 96.032 16.407 0.000
Previous.e 3.997 1.095 657.808 3.649 0.000
Current.e:Previous.e 2.622 1.444 141.420 1.815 0.072

Marginal means:
Error bars represent standard error.

Fixed effects at middle of task:
Estimate Std. Error df t value Pr(>|t|)
(Intercept) 407.440 7.195 48.992 56.631 0.000
Current.e 26.956 1.457 48.384 18.503 0.000
Previous.e 2.687 0.575 51.227 4.674 0.000
Current.e:Previous.e 0.974 1.102 48.105 0.883 0.382

Marginal means:
Error bars represent standard error.

Fixed effects at end of task:
Estimate Std. Error df t value Pr(>|t|)
(Intercept) 404.479 7.258 50.742 55.726 0.000
Current.e 25.538 1.744 99.255 14.646 0.000
Previous.e 1.377 1.118 715.330 1.232 0.218
Current.e:Previous.e -0.674 1.461 148.190 -0.461 0.645

Marginal means:
Error bars represent standard error.

B. CompleteRep trials taken out

Plot over whole task

Slopes and estimates of lines are from the MLM, not fitted with OLS.

Simple slopes

Trial is scaled to range from 0 to 8 (instead of 1 to 800) so that the betas associated with trial are a little bigger (but significance testing is unaffected by linear scaling, so the test statistics and p values will be the same as if we used the unscaled Trial variable).

Estimate SE ci95_lower ci95_upper Current Previous Color
-0.455 0.524 -1.50 0.5920 Compat Compat blue dashed
-0.542 0.390 -1.32 0.2389 Compat Incompat red dashed
-1.664 0.392 -2.45 -0.8792 Incompat Compat blue solid
-1.053 0.575 -2.20 0.0982 Incompat Incompat red solid
Fixed effects of Trial and interactions with Trial:

Trial is centered and scaled to range from -4 to 4.

Estimate Std. Error df t value Pr(>|t|)
Trial.begin -0.908 0.239 25861.52 -3.804 0.000
Current.e:Trial.begin -0.416 0.239 25855.81 -1.746 0.081
Previous.e:Trial.begin 0.143 0.239 25863.94 0.601 0.548
Current.e:Previous.e:Trial.begin 0.182 0.239 25852.83 0.761 0.447
Fixed effects at beginning of task:
Estimate Std. Error df t value Pr(>|t|)
(Intercept) 413.799 7.345 50.642 56.341 0.000
Current.e 30.649 1.740 96.628 17.618 0.000
Previous.e -0.107 1.128 1065.792 -0.095 0.924
Current.e:Previous.e -1.505 1.249 254.430 -1.205 0.229

Marginal means:
Error bars represent standard error.

Fixed effects at middle of task:
Estimate Std. Error df t value Pr(>|t|)
(Intercept) 410.169 7.284 49.003 56.309 0.000
Current.e 28.983 1.465 48.568 19.789 0.000
Previous.e 0.467 0.624 103.819 0.747 0.456
Current.e:Previous.e -0.779 0.823 48.282 -0.946 0.349

Marginal means:
Error bars represent standard error.

Fixed effects at end of task:
Estimate Std. Error df t value Pr(>|t|)
(Intercept) 406.539 7.349 50.752 55.322 0.000
Current.e 27.318 1.756 100.340 15.554 0.000
Previous.e 1.040 1.153 1155.210 0.902 0.367
Current.e:Previous.e -0.052 1.272 273.231 -0.041 0.967

Marginal means:
Error bars represent standard error.